Prevention and Control of Diseases and insect pests of Panax Notoginseng
1. Disease
1.1 Black spot mostly occurred in the high temperature and humid season from June to July, which caused the plant to break and die. The prevention and control method is to adjust the transmittance of the shade to less than 20%, and spray with 1.5% more than 150 times of antimycin or 700% chlorothalonil wettable powder 600 times 800 times.
1.2 Blight is a destructive disease in the seedling stage of Panax notoginseng. Most of them occur from June to July, harming leaves and petioles. The prevention and control method is to strengthen the field management, reduce the temperature and humidity, remove the remains in time, burn them centrally, and spray them with 65% Dysen zinc wettable powder 500 times.
1.3 Rhizoctonia solani mostly occurs in the season of high humidity and low temperature from April to May, which harms the base of seedlings. The method of prevention and control is to irrigate the root with 500 times 800 times of 70% dimethazone wettable powder and spray.
1.4 Root rot is the main root disease of Panax notoginseng. Most of them occur from late April to early July. The control method is to irrigate the root with 58% Ruidu wettable powder or 50% carbendazim wettable powder 300 × 500 times.
two。 Insect pest
2.1 the control method of slugs (slugs) is to spray lime powder on the border in the evening on a sunny day.
2.2 the control method of red spider is to spray 1000 times of dimethoate EC.
2.3 the control method of small ground tiger is to use 90% crystal trichlorfon mixed with poison bait or 1000-1500 times liquid to irrigate.
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Propagation method of Panax notoginseng
[propagation method] Cuttage propagation is commonly used. The long stem segment of lOcm was selected in spring and autumn, and one or two leaves were inserted into the mixed medium of peat and sand. Put the countable branches in a pot and water them for the first time. Cover them with plastic film and place them in bright light, then spray fog on the leaves once or twice a day according to the dry and wet conditions. it is easy to rot if it is too wet, and it will take root for 3 weeks. Can also use water culture method, to ensure that the water temperature is higher than the air temperature, a few weeks later can take root. [cultivation management] adequate light is required all year round, but sun should be avoided in summer.
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Leaf rot of medicinal plant Panax notoginseng
Symptoms can affect all aerial organs except the roots. The most typical symptom is to cause black fusiform lesions on the top of petioles. When the temperature is high, they quickly circle around the petioles and quickly expand to the base of the leaflets, forming pale black water-soaked lesions on the leaves with irregular edges. The diseased part of the petiole softens quickly, causing the upper leaflet to droop (commonly known as "twisted footwall"). In the disease often visible yellow with pink mold, that is, the fruiting body of the pathogen. When it damages the middle part of the leaf, it forms black irregular spots with irregular edges.
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